Where are the cells that make up the sinoatrial node, or pacemaker, located? a. right atrium c. right ventricle b. left atrium d. left ventricle

List charasteristics of athenosphere

Name the types of burns one can get and which structures of the integument are damaged

How have high taxes on tobacco products impacted the number of people who use them? a. the number of tobacco users has increased. b. the number of tobacco users has decreased. c. the number of tobacco users has not changed. d. the number of adolescent tobacco users decreased, while the number of adult users increased